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Standard 1091, Edition 6

Standard for Butterfly Valves for Fire-Protection Service

UL CSDS Proposal
Standard 1091, Edition 6 Edition Date: December 07, 2009
Summary of Topics b1091_6_20091207_sum.html

Subject 1091

Bulletin Dated: December 7, 2009


The following changes in requirements to the Standard for Butterfly Valves for Fire-Protection Service, UL 1091, are being proposed for preliminary review and comment only:

1. For Preliminary Review Only: Reference to Nominal Pipe Size

2. For Preliminary Review Only: Guidelines for Conducting Operating Torque Value Calculations for Butterfly Valves

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